Content Determination of Polysaccharide from Dendrobium nobile Cultivated in Guizhou and Sichuan / 中国药房

ABSTRACT

OBJECTIVE:To compare the content of polysaccharide from Dendrobium nobile cultivated in Guizhou and Sichuan,and to establish content determination method of polysaccharide from D.nobile.METHODS:Polysaccharide was extracted from D.nobile using water extraction alcohol precipitation.The content of polysaccharide from D.nobile cultivated in different areas was determined by phenol-sulfuric acid method with glucose as standard substance at UV wavelength of 490 nm.RESULTS:The linear range of polysaccharide from D.nobile was 1.25～8.75 ?g?mL-1(r=0.999 4).The average recovery of D.nobile cultivated in Chishui of Guizhou province was 101.6%(RSD=1.9%,n=6),and the content of polysaccharide was 11.456%;the content of polysaccharide from D.nobile cultivated in Hejiang of Sichuan province was 9.226%.CONCLUSIONS:Phenol-sulfuric acid method is simple,reliable,accurate,sensitive and stable for the content determination of polysaccharide from D.nobile.D.nobile cultivated in Chishui of Guizhou province is the best choice for the extraction of polysaccharide from D.nobile.